class Server : public QObject

$\{$

Q$\_$OBJECT

public:

explicit Server$($QObject $*$parent $=0)$; $//$must be explicitly called to create an object of the Server class. The constructor takes a single parameter of type QObject$*,$ which is a pointer to an object of the QObject class $($or one of its subclasses$).$ The parameter is given a default value of nullptr $($or $0$ in older code$),$ which means that if the constructor is called without providing a value for parent, it will default to a null pointer.

signals:

void dataReceived$($QByteArray$)$;$//$The dataReceived signal you provided declares a signal named dataReceived that takes a single parameter of type QByteArray. This signal indicates that an object of this class emits the dataReceived signal when it receives data, and it passes a QByteArray containing the received data as an argument.

private slots:$//$can be connected to signals

void newConnection$()$;

void disconnected$()$;

void readyRead$()$;

private:

QTopServer $*$server;

QHash buffers;

QHash sizes;

$\}$;

Server :: Server$($QObject$*$parent$)$ : QObject$($parent$)$

$\{$

server $=$ new QTopServer$($this$)$;

connect$($server$,$SIGNAL$($newConnection$()),$ SLOT$($newConnection$()))$;

server$->$listen$($QHostAddress::Any,$7755)$;

$\}$

void Server :: newConnection$()$

$\{$

while$($server$->$hasPendingConnections$())$

$\{$

QTopSocket $*$socket $=$ server$->$nextPendingConnection$()$;

connect$($socket$,$ SIGNAL$($readyRead$()),$ this, SLOT$($readyRead$()))$;

connect$($socket$,$ SIGNAL$($desconnected$()),$ this, SLOT$($disconnected$()))$;

QByteArray $*$buffer $=$ new QByteArray$()$;

qint$32*$s $=$ new qint$32(0)$;

buffers.insert$($socket$,$ buffer$)$;

sizes.insert$($socket$,$ s$)$;

$\}$

$\}$

void Server :: disconnected$()$

$\{$

QTopSocket $*$socket $=$ static.cast$($sender$())$;

QByteArray $*$buffer $=$ buffers.value$($socket$)$;

buffers.remove$($socket$)$;

qint$32*$s $=$ sizes.value$($socket$)$;

sizes.remove$($socket$)$;

socket$->$deleteLater$()$;

delete buffer;

delete s;

$\}$

void Server :: readyRead$()$

$\{$

QTopSocket $*$socket $=$ static.cast$($sender$())$;

QByteArray $*$buffer $=$ buffer.value$($socket$)$;

qint$32*$s $=$ sizes.value$($socket$)$;

qint$32$ size $=*$s;

while$($socket$->$bytesAvailable$()>0)$

$\{$

buffer$->$append$($socket$->$readAll$())$

$\}$

$\}$

Can you please draw a class diagram which include the following classes: QObject $,$ QTopSocket, Server, QByteArray, QTopServer. There must be attributes or methods in classes